Merge branch 'chore/bo-bootstrap5' into 'develop'

src/backoffice/forms.py

src/backoffice/locale/de/LC_MESSAGES/django.po

src/backoffice/locale/en/LC_MESSAGES/django.po

src/backoffice/templates/backoffice/assembly_badges.html

src/backoffice/templates/backoffice/assembly_basicdata.html

src/backoffice/templates/backoffice/assembly_detail.html

src/backoffice/templates/backoffice/assembly_edit.html

src/backoffice/templates/backoffice/assembly_editlinks.html

src/backoffice/templates/backoffice/assembly_events.html

...backoffice/templates/backoffice/assembly_list_export.html

...ackoffice/templates/backoffice/assembly_members_edit.html

src/backoffice/templates/backoffice/assembly_room.html

src/backoffice/templates/backoffice/assembly_room_wa.html

...ce/templates/backoffice/assembly_room_wa_linterblock.html

src/backoffice/templates/backoffice/base.html

...ckoffice/templates/backoffice/schedule_source-detail.html

src/backoffice/templates/backoffice/wa-map-detail.html

src/backoffice/templates/backoffice/wa-session-detail.html

src/backoffice/templates/backoffice/wa-texture-form.html

src/backoffice/templates/backoffice/wa-texture-list.html